Electromagnetic connector for an industrial control system

ABSTRACT

An electromagnetic connector is disclosed that is configured to form a first magnetic circuit portion comprising a first core member and a first coil disposed of the first core member. The electromagnetic connector is configured to mate with a second electromagnetic connector, where the second electromagnetic connector is configured to form a second magnetic circuit portion comprising a second core member and a second coil disposed of the second core member. The first core member and the second core member are configured to couple the first coil to the second coil with a magnetic circuit formed from the first magnetic circuit portion and the second magnetic circuit portion when the electromagnetic connector is mated with the second electromagnetic connector. The magnetic circuit is configured to induce a signal in the first coil when the second coil is energized.

BACKGROUND

Electrical connectors are mechanical assemblies used to complete an electrical circuit or join two or more electrical circuits together. Plug and socket type electrical connectors generally include a male plug and a female receptacle, with multiple pin or prong contacts in the male plug configured for insertion into openings in a mating socket of the female receptacle. Multi-pin connectors employ multiple metal pins. Thus, the connections between mating metal parts (e.g., pins and sockets) must be capable of furnishing good electrical connections to complete the electrical circuits. For example, multi-pin connectors are used as interconnects in Industrial Control Systems (ICS)/Process Control Systems (PCS) to connect Input/Output (I/O) devices to power and/or communications signal transmission circuitry. Such circuitry may be used by, for instance, a power backplane, where multiple electrical connectors are connected in parallel to a common electrical power supply. Other types of electrical connectors include: Eight Positions, Eight Conductors (8P8C) modular connectors used for Ethernet and Category 5 (CAT5) cables; D-subminiature connectors used for Recommended Standard 232 (RS-232) modem serial ports, computers, telecommunications, test/measurement instruments, monitors, joysticks, mice, and game consoles; Universal Serial Bus (USB) connectors, including Type A, Type B, Mini-A, Mini-B, Micro-A, and Micro-B connectors used for interfacing devices; electrical power connectors, such as Alternating Current (AC) power plugs and sockets (e.g., plugs having protruding prongs, blades, and/or pins that fit into matching slots and/or holes in sockets, receptacles, outlets, power points, and so forth), and Direct Current (DC) connectors, such as coaxial power connectors; as well as Radio Frequency (RF) connectors for transmitting RF signals; and the like.

SUMMARY

An electromagnetic connector is disclosed. In one or more implementations, the electromagnetic connector is configured to form a first magnetic circuit portion that comprises a first core member and a first coil disposed of the first core member. The electromagnetic connector is configured to mate with a second electromagnetic connector, where the second electromagnetic connector is configured to form a second magnetic circuit portion that comprises a second core member and a second coil disposed of the second core member. The first core member and the second core member are configured to couple the first coil to the second coil with a magnetic circuit formed from the first magnetic circuit portion and the second magnetic circuit portion when the electromagnetic connector is mated with the second electromagnetic connector. The magnetic circuit is configured to induce a signal in the first coil when the second coil is energized.

This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

DRAWINGS

The Detailed Description is described with reference to the accompanying figures. The use of the same reference numbers in different instances in the description and in FIGS. 2 through 15 may indicate similar or identical items.

FIG. 1 is a block diagram illustrating an industrial control system using a backplane for power transmission, where arrows are used to indicate power flow.

FIG. 2 is a partial cross-sectional isometric view illustrating electromagnetic connectors in accordance with example implementations of the present disclosure.

FIG. 3A is a diagrammatic illustration of a connector assembly comprising an E-shaped core member for coupling a module to a backplane in accordance with example implementations of the present disclosure.

FIG. 3B is a diagrammatic illustration of the connector assembly illustrated in FIG. 3A, where electromagnetic connectors are mated to couple the module to the backplane.

FIG. 4A is a diagrammatic illustration of a connector assembly comprising an interference core for coupling a module to a backplane in accordance with example implementations of the present disclosure.

FIG. 4B is a diagrammatic illustration of the connector assembly illustrated in FIG. 4A, where electromagnetic connectors are mated to couple the module to the backplane.

FIG. 4C is a diagrammatic illustration of a connector assembly comprising an interference core and a protective cover for coupling a module to a backplane in accordance with example implementations of the present disclosure.

FIG. 4D is a diagrammatic illustration of the connector assembly illustrated in FIG. 4C, where electromagnetic connectors are mated to couple the module to the backplane.

FIG. 5 is a block diagram illustrating a system for distributing power and/or communications signals along a backplane using distributed transformers implemented with electromagnetic connectors in accordance with example implementations of the present disclosure, where arrows are used to indicate power flow.

FIG. 6 is a circuit diagram of the system illustrated in FIG. 5.

FIG. 7 is a block diagram illustrating a communications control system in accordance with example implementations of the present disclosure.

FIG. 8 is a circuit diagram illustrating a switch fabric for a communications control system in accordance with example implementations of the present disclosure.

FIG. 9 is an isometric view illustrating a communications control system in accordance with example implementations of the present disclosure.

FIG. 10 is a side elevation view of the communications control system illustrated in FIG. 9.

FIG. 11 is an end view of the communications control system illustrated in FIG. 9.

FIG. 12 is a partial cross-sectional end view of the communications control system illustrated in FIG. 9.

FIG. 13 is a cross-sectional end view illustrating an input/output module for the communications control system illustrated in FIG. 9.

FIG. 14 is an isometric view illustrating a support frame with an attached circuit board for the communications control system illustrated in FIG. 9.

FIG. 15 is a flow diagram illustrating a process of forming a first electromagnetic connector configured to form a first magnetic circuit portion comprising a first core member and a first coil disposed of the first core member, forming a second electromagnetic connector configured to form a second magnetic circuit portion comprising a second core member and a second coil portion disposed of the second core member, and coupling the first coil to the second coil by mating the first electromagnetic connector with the second electromagnetic connector in accordance with example implementations of the present disclosure.

DETAILED DESCRIPTION

Overview

Multi-pin connectors are typically used in industrial control systems/process control systems to connect I/O devices to power and/or communications signal transmission circuitry included with a power backplane. The pin interconnects provide high precision signal resolution and are often constructed from high quality materials, such as hardened steel with gold plating, and so forth. Care must be taken when connecting and disconnecting multi-pin connectors to avoid bending or misaligning the various pins. Additionally, in both industrial settings and in the field, pin interconnects are often exposed to corrosive materials and contaminants, and may be subject to oxidation and coating, leading to intermittent failures. The nature and cause of the failures may be difficult and costly to determine. Thus, multi-pin connectors are generally a high cost and high maintenance component of industrial control systems hardware.

Industrial control systems/process control systems may also require electrical isolation between I/O devices and associated power transmission and control equipment. For example, I/O devices typically use transformers and/or optical equipment for signal transmission to electrically isolate the I/O devices, prevent ground loops, and so forth. Industrial systems, such as the example system 10 shown in FIG. 1, may provide a backplane 12 for power and/or communications signal transmission, with pluggable I/O devices 14 connected to the backplane 12. Each pluggable I/O device 14 may use multi-pin connectors 16 for both power and communications transmissions, along with Pulse-Width Modulation (PWM)/Pulse-Duration Modulation (PDM) 18 and a power transformer 20 to achieve isolation between the backplane 12 and the I/O devices 14. For example, the backplane 12 may use a DC power source 22 and connectors 24 that mate with connectors 16 to deliver DC signals to the I/O devices 14. Each I/O device 14 may then use PWM 18 to convert the DC signals to AC and transformer 20 to deliver the power/communications signals to circuitry 26. The use of the high quality multi-pin connectors, PWM circuitry, and power transformers increases the cost and complexity of the I/O devices.

Accordingly, electromagnetic connector assemblies are described that employ electromagnetic connectors which form portions of a magnetic circuit. The electromagnetic connectors comprise a core member and a coil disposed of the core member. In implementations, the electromagnetic connectors are configured to mate with other electromagnetic connectors so that, when one electromagnetic connector is mated with another electromagnetic connector, the core members of the connectors couple the coil of the first connector to the coil of the second connector to complete the magnetic circuit. The magnetic circuit is configured to induce a signal in one coil when the other coil is energized.

Electromagnetic connectors configured in accordance with the present disclosure need not necessarily require precision contact, pressure, and/or alignment to complete the magnetic circuit linking the tightly coupled coils. In implementations, the electromagnetic connectors can be used in industrial control systems having a power backplane/bus configuration. For example, the electromagnetic connectors can be used with one or more I/O modules in place of the PWM, separate power transformer, and associated transistors that would otherwise be required for each I/O module to maintain isolation between the I/O modules and the power backplane. The electromagnetic connectors can also be used in place of multi-pin connectors for communications and/or power signal transmission. Eliminating multiple PWM's, power transformers, transistors, and multi-pin connectors can provide a significant cost and space savings for this type of configuration, along with increased galvanic isolation between sensor and control components. Further, contactless interconnection for signal transmission may provide more environmentally robust structures, reducing or eliminating field failures due to corrosion, pin misalignment, and so forth.

In one or more implementations, the electromagnetic connector assemblies may be employed in a system that includes a backplane for distributing an AC signal. The system may include a number of electromagnetic connectors coupled with the backplane. As described herein, the electromagnetic connectors comprise a core member and a coil disposed of the core member (e.g., as previously described). Each one of the electromagnetic connectors is configured to mate with another electromagnetic connector, which may be included within a module. When the electromagnetic connectors are mated, the coils are coupled via a magnetic circuit. The magnetic circuit is configured to induce a signal in a coil of the module when a coil of the backplane is energized. The backplane may be used to power and/or furnish communications with circuitry of the module.

The system can be configured for an industrial control system/process control system having a multidrop power backplane/bus configuration that transmits high frequency AC power using DC-to-AC (DC/AC) conversion circuitry and distributed transformers, with electromagnetic connectors configured as previously described. A system configured in accordance with the present disclosure can eliminate the use of a separate PWM for each I/O device, replacing multiple PWMs with, for example, a single PWM located on the backplane. Thus, the connector and power transformer configuration described with reference to FIG. 1 can be replaced with magnetic circuits (e.g., tightly coupled transformers). Each magnetic circuit may be configured as two portions (e.g., halves) of a transformer, where one portion (e.g., half) of the transformer is located in each module, and the other portion (e.g., half) is located in the backplane. The portion of the transformer in the backplane may comprise, for example, the primary coil and a portion of the core. The portion of the transformer in each module may comprise the secondary coil and a mating core. Electrical power in the primary coil is extracted by the secondary coil, and can then be rectified and used to power and/or communicate with circuitry in each module.

For example, a system configured in accordance with the present disclosure may be implemented as a communications control system that includes a switch fabric having a serial communications interface (e.g., a serial or Multidrop Bus (MDB) with a master and multiple slaves) and a parallel communications interface (e.g., a parallel or point-to-point bus implemented using a cross switch, or the like). The serial communications interface and the parallel communications interface may be used for connecting multiple Input/Output (I/O) modules to communications/control modules, and to one another.

The serial communications interface and the parallel communications interface may be formed on a single printed circuit board. The serial communications interface may be configured for connecting the plurality of input/output modules to a redundant control module in parallel, and the parallel communications interface may be configured for separately connecting the plurality of input/output modules to the redundant control module. Information transmitted via the serial communications interface and/or the parallel communications interface may be packetized. The control module may comprise a network interface for transmitting information collected from the plurality of input/output modules via a network, and so forth. Additionally, the communications control system may include a power module for supplying electrical power to at least one of the plurality of input/output modules.

Example Implementations

FIGS. 2 through 4D illustrate example electromagnetic connectors 100 a and 100 b of connector assemblies 110 in accordance with example implementations of the present disclosure. The electromagnetic connectors 100 a and 100 b may be used in any application where it is desirable to couple electrical circuits together for transmitting electrical signals and/or electrical power from one circuit to another, while maintaining isolation between the circuits. The electromagnetic connectors 100 a and 100 b can be used in applications including, but not necessarily limited to: industrial control systems/process control systems (e.g., to connect I/O devices with power and/or communications signal transmission circuitry), telecommunications (e.g., for audio, broadband, video, and/or voice transmission), information/data communications (e.g., for connecting computer networking equipment, such as Ethernet equipment, modems, and so forth), computer hardware interconnection (e.g., for connecting peripherals, such as joysticks, keyboards, mice, monitors, and so on), game consoles, test/measurement instruments, electrical power connectors (e.g., for power transmission from AC mains), and the like.

Each one of the electromagnetic connectors 100 a and 100 b is configured to form a magnetic circuit portion 102 a or 102 b , which includes a core member 104 a or 104 b and a coil 106 a or 106 b disposed of (e.g., around or within) the core member 104 a or 104 b. For the purposes of the present disclosure, it should be noted that “core member” is used to refer to an incomplete part of a magnetic core, which is completed by another core member when the electromagnetic connectors 100 a and 100 b are coupled together. Each electromagnetic connector 100 a or 100 b is configured to mate with another electromagnetic connector 100 a or 100 b of a connector assembly 110 for transmitting power and/or communications signals between components that are connected via the electromagnetic connectors 100 a and 100 b . For example, a first core member 104 a of an electromagnetic connector 100 a can be configured to contact a second core member 104 b of another electromagnetic connector 100 b when the first electromagnetic connector 100 a is mated with the second electromagnetic connector 100 b (e.g., as shown in FIG. 3B). In this manner, a coil 106 a of the first electromagnetic connector 100 b can be tightly coupled to another coil 106 b of the second electromagnetic connector 100 b with a magnetic circuit 108 formed from the magnetic circuit portion 102 a of the first electromagnetic connector 100 a and the magnetic circuit portion 102 b of the second electromagnetic connector 100 b . The magnetic circuit 108 is configured to induce a signal in one of the coils 1066 a or 106 b when the other coil 106 a or 106 b is energized, allowing power and/or communications signals to be transmitted between components that are connected via the electromagnetic connectors 100 a and 100 b. In implementations, the coils 106 a and 106 b can be tightly coupled (e.g., using an iron core to provide a coupling coefficient of about one (1)), critically coupled (e.g., where energy transfer in the passband is optimal), or overcoupled (e.g., where a secondary coil is close enough to a primary coil to collapse the primary coil's field).

Referring to FIGS. 4A through 4D, the first core member 104 a may not necessarily be configured to contact the second core member 104 b when the first electromagnetic connector 100 a is mated with the second electromagnetic connector 100 b (e.g., as shown in FIGS. 4B and 4D). Thus, an electromagnetic connector assembly 110 can be configured to transmit power and/or communications signals between components that are connected via electromagnetic connectors 100 a and 100 b using, for example, an interference fit configuration, e.g., as shown in FIGS. 4A through 4D, where one coil 106 a is disposed around a first core portion 104 a , while another coil 106 b is disposed within a second core portion 104 b . Theinterference fit may be established using connectors having geometries including, but not necessarily limited to: conical, concentric, eccentric, geometric, sloped for friction fit, and so forth.

In implementations, one or both of the core members 104 a and/or 104 b and/or coils 106 a and/or 106 b can be at least partially (e.g., fully or partially) mechanically encased within a protective layer. The protective layer may be fabricated of a non-conductive/insulating material, such as a coating of thin film plastic material. The protective layer (e.g., non-conductive/insulating material) can be applied using techniques including, but not necessarily limited to: coating, painting, deposition, and so forth. For instance, as shown in FIGS. 4C and 4D,the core member 104 b and coil 106 b of an electromagnetic connector 100 b included within module 122 is partially enclosed by a cover 126, while an electromagnetic connector 100 a included within backplane 120 includes a shaft 128 configured to mate with the cover 126. In this manner, the cover 126 and the shaft 128 may be configured to ensure proper alignment of the electromagnetic connector 100 b with the electromagnetic connector 100 a, while protecting the core member 104 b and/or the coil 106 b of the electromagnetic connector 100 b from corrosion, mechanical damage (e.g., fracture), and so forth. Encasement may be especially useful when a core member 104 a and/or 104 b is constructed from a brittle material. For instance, the core member 104 b can be tightly encased in a protective layer formed of a plastic material. In this manner, when damage to the core member (e.g., cracks or breaks in the core member) occurs, the pieces of material can be maintained in substantial contact with one another within the casing, thus damage to the core material may not significantly decrease performance.

FIGS. 3A through 6 illustrate an example system 114 in accordance with example implementations of the present disclosure. The system 114 includes DC/AC conversion circuitry, such as DC/AC converter 116, or the like, for converting a DC signal to an AC signal. For instance, the DC signal may be supplied from a DC power source 118 and converted to an AC signal using the DC/AC converter 116. In implementations, the DC/AC converter 116 can be implemented using a PWM/PDM. However, the PWM/PDM is provided by way of example only and is not meant to be restrictive of the present disclosure. Thus, DC/AC converter 116 may be implemented using other DC/AC conversion circuitry, including, but not necessarily limited to: a voltage to frequency converter and/or a cascade topology (e.g., where two or more PWM's are connected in cascade). The system 114 also includes one or more backplanes 120, each coupled with a DC/AC converter 116 for distributing the AC signal from the DC/AC converter 116. Each backplane 120 has a number of electromagnetic connectors 100 a, where each one of the electromagnetic connectors 100 a includes a core member 104 a and a coil 106 a disposed of the core member 104 a (e.g., as previously described). Each one of the electromagnetic connectors 100 a included with a backplane 120 is configured to mate with another electromagnetic connector 100 b that can be included with, for example, modules 122, and so forth.

When the electromagnetic connectors 100 a and 100 b are mated, a core member 104 a of the backplane 120 and a core member 104 b of a module 122 are configured to couple the coils 106 b and 106 b via magnetic circuit 108. The magnetic circuit 108 is configured to induce a signal in coil 106 b of module 122 when coil 106 a of backplane 120 is energized (e.g., with the AC signal from DC/AC converter 116). The signal induced in coil 106 b of module 122 may be used to power and/or furnish communications with circuitry 124 of module 122. It should be noted that while backplane 120 is described as inducing a signal in module 122, this implementation is provided by way of example only and is not meant to of the present disclosure. Thus, the magnetic circuit 108 can also be used to induce a signal in a coil 106 a of backplane 120 when a coil 106 b of module 122 is energized to power and/or furnish communications with backplane 120. Further, the coils included with mating electromagnetic connectors may be energized in an alternating sequence (e.g., one after another) to provide bidirectional communication, and so forth.

FIGS. 7 through 14 illustrate an example communications control system 200 in accordance with the present disclosure. In implementations, the communications control system 200 may be configured for use with process control systems technology, and so forth. For example, the communications control system 200 may be used with a distributed control system comprised of controller elements and subsystems, where the subsystems are controlled by one or more controllers distributed throughout the system. The communications control system 200 includes a switch fabric 202 comprising a serial communications interface 204 and a parallel communications interface 206 for furnishing communications with a number of I/O modules 208. As shown in FIGS. 7 and 14, the I/O modules 208 can be connected to the communications control system 200 using one or more electromagnetic connectors 100 a and 100 b (e.g., as shown and described with reference to FIGS. 2 through 6). For instance, each I/O module 208 can include one or more connectors 100 b /connector assemblies 110, with core members extending through coils.

As shown in FIG. 2, the coils can be implemented as planar windings on a circuit board. When included in a module 208, the circuit board can be “floated” against a partial spring load, allowing for some movement of the circuit board perpendicular to the plane of a core member, e.g., to compensate for tolerances across the circuit board. For example, a self-holding spring loading mechanism can be provided in the module to provide a constant downward pressure to facilitate mating of the electromagnetic connection, compensating for stacked tolerances of the module, PCB, and baseplate/support frame and ensuring a constant mating of both halves of an electromagnetic connector assembly. In a particular implementation, a “tongue and groove” configuration can be used that provides inherent fastening and support in three planes. For example, a printed circuit board included within an I/O module 208 can be configured to slide along and between two track segments in a direction perpendicular to the plane of a core member. Further, a core member can be mechanically isolated from (e.g., not touching) the circuit board. It should be noted that the implementation with planar primary and secondary windings described with reference to FIG. 2 is provided by way of example only and is not necessarily meant to be restrictive of the present disclosure. Thus, other implementations can use other coil configurations, such as wire wound coils, and so forth. For example, the primary coil may comprise a planar winding, and the secondary coil may comprise a wire wound coil. Further, the primary coil may comprise a wire wound coil, and the secondary coil may comprise a planar winding. In other implementations, primary and secondary coils may both comprise wire wound coils.

The serial communications interface 204 may be implemented using a group of connectors connected in parallel with one another. In one or more implementations, the connectors may be configured as electromagnetic connectors 100 a and/or 100 b/connector assemblies 110 (e.g., as previously described). For example, the serial communications interface 204 may be implemented using a multidrop bus 210, or the like. In implementations, the multidrop bus 210 may be used for configuration and diagnostic functions of the I/Omodules 208. The parallel communications interface 206 allows multiple signals to be transmitted simultaneously over multiple dedicated high speed parallel communication channels. For instance, the parallel communications interface 206 may be implemented using a cross switch 212, or the like.

In a particular implementation, as described in FIG. 8, the parallel communications interface 206 can be implemented using a four (4) wire full duplex cross switch 212 with a dedicated connection to each I/O module 208. In implementations, each connection may be furnished using one or more electromagnetic connectors 100 a and/or 100 b /connector assemblies 110 (e.g., as previously described). The cross switch 212 can be implemented as a programmable cross switch connecting point-to-point busses and allowing traffic between the I/O modules 208. The cross switch 212 may be configured by a master device, such as a communications/control modulo 214. For example communications/control module 214 may configure one or more sets of registers included in the cross switch 212 to control traffic between the I/O modules 208. In implementations, a communications/control module 214 may comprise a rule set dictating how the I/O modules 208 are interconnected. For example, a communications/control module 214 may comprise a set of registers, where each register defines the operation of a particular switch (e.g., with respect to how packets are forwarded, and so forth). Thus, the cross switch 212 may not necessarily auto-configure, instead implementing a configuration provided by a communications/control module 214. However, this configuration is provided by way of example only and is not meant to be restrictive of the present disclosure. Thus, in other implementations, the cross switch 212 may auto-configure.

The parallel communications interface 206 may be used for data collection from the I/O modules 208. Further, because each I/O module 208 has its own private bus to the master (e.g., communications/control modules 214), each I/O module 208 can communicate with the master at the same time. Thus, the total response time for the communications control system 200 may be limited to that of the slowest I/O module 208, instead of the sum of all slave devices.

In implementations, the switch fabric 202, the serial communications interface 204, and the parallel communications interface 206 may be implemented in a single, monolithic circuit board 216, e.g., with multiple E-shaped core members of electromagnetic connectors 100 a extending through the circuit board 216, as shown in FIG. 14. In implementations, the core members may be mechanically isolated from the circuit board 216 (e.g., not touching the circuit board 216). However, this configuration is provided by way of example only and is not meant to be restrictive of the present disclosure. Thus, the serial communications interface 204 and the parallel communications interface 206 may be implemented using different arrangements of multiple components, such as multiple discrete semiconductor devices for implementing the serial communications interface 204 and the parallel communications interface 206 separately, and so forth.

The switch fabric 202 may be configured for connecting one or more I/O modules 208 and transmitting data to and from the I/O modules 208. The I/O modules 208 may comprise input modules, output modules, and/or input and output modules. For instance, input modules can be used to receive information from input instruments in the process or the field, while output modules can be used to transmit instructions to output instruments in the field. For example, an I/O module 208 can be connected to a process sensor, such as a sensor 218 for measuring pressure in piping for a gas plant, a refinery, and so forth. In implementations, the I/O modules 208 may be used to collect data and control systems in applications including, but not necessarily limited to: industrial processes, such as manufacturing, production, power generation, fabrication, and refining; infrastructure processes, such as water treatment and distribution, wastewater collection and treatment, oil and gas pipelines, electrical power transmission and distribution, wind farms, and large communication systems; facility processes for buildings, airports, ships, and space stations (e.g., to monitor and control Heating, Ventilation, and Air Conditioning (HVAC) equipment and energy consumption); large campus industrial process plants, such as oil and gas, refining, chemical, pharmaceutical, food and beverage, water and wastewater, pulp and paper, utility power, mining, metals; and/or critical infrastructures.

In implementations, the I/O module 208 may be configured to convert analog data received from the sensor 218 to digital data (e.g., using Analog-to-Digital Converter (ADC) circuitry, and so forth). An I/O module 208 may also be connected to a motor 220 and configured to control one or more operating characteristics of the motor 220, such as motor speed, motor torque, and so forth. Further, the I/O module 208 may be configured to convert digital data to analog data for transmission to the motor 220 (e.g., using Digital-to-Analog (DAC) circuitry, and so forth). In implementations, one or more of the I/O modules 208 may comprise a communications module configured for communicating via a communications sub-bus, such as an Ethernet bus, an H1 field bus, a Process Field Bus (PROFIBUS), a Highway Addressable Remote Transducer (HART) bus, a Modbus, and so forth. Further, two or more of the I/O modules 208 can be used to provide fault tolerant and redundant connections for a communications sub-bus.

Each I/O module 208 may be provided with a unique identifier (ID) for distinguishing one I/O module 208 from another I/O module 208. In implementations, an I/O module 208 may be identified by its ID when it is connected to the communications control system 200. Multiple I/O modules 208 can be used with the communications control system 200 to provide redundancy. For example, two or more I/O modules 208 can be connected to the sensor 218 and/or the motor 220, as described in FIG. 7. Each I/O module 208 can include one or more ports 222 furnishing a physical connection to hardware and circuitry included with the I/O module 208, such as a Printed Circuit Board (PCB) 224, and so forth.

One or more of the I/O modules 208 may include an interface for connecting to other networks, including but not necessarily limited to: a wide-area cellular telephone network, such as a 3G cellular network, a 4G cellular network, or a Global System for Mobile communications (GSM) network; a wireless computer communications network, such as a Wi-Fi network (e.g., a Wireless LAN (WLAN) operated using IEEE 802.11 network standards); a Personal Area Network (PAN) (e.g., a Wireless PAN (WPAN) operated using IEEE 802.15 network standards); a Wide Area Network (WAN); an intranet; an extranet; an internet; the Internet; and so on. Further, one or more of the I/O modules 208 may include a connection for connecting an I/O module 208 to a computer bus, and so forth.

The switch fabric 202 may be coupled with one or more communications/control modules 214 for monitoring and controlling the I/O modules 208, and for connecting the I/O modules 208 together. The communications/control module(s) 214 may be used to configure the cross switch 212. For example, a communications/control module 214 may update a routing table when an I/O module 208 is connected to the communications control system 200 based upon a unique ID for the I/O module 208. Further, when multiple redundant I/O modules 208 are used, each communications/control module 214 can implement mirroring of informational databases regarding the I/O modules 208 and update them as data is received from and/or transmitted to the I/O modules 208. In some implementations, two or more communications/control modules 214 may be used to provide redundancy.

Data transmitted using the switch fabric 202 may be packetized, i.e., discrete portions of the data may be converted into data packets comprising the data portions along with network control information, and so forth. The communications control system 200 may use one or more protocols for data transmission, including a bit-oriented synchronous data link layer protocol such as High-Level Data Link Control (HDLC). In a specific instance, the communications control system 200 may implement HDLC according to an International Organization for Standardization (ISO) 13239 standard, or the like. Further, two or more communications/control modules 214 can be used to implement redundant HDLC. However, it should be noted that HDLC is provided by way of example only and is not meant to be restrictive of the present disclosure. Thus, the communications control system 200 may use other various communications protocols in accordance with the present disclosure.

One or more of the communications/control modules 214 may be configured for exchanging information with components used for monitoring and/or controlling the instrumentation connected to the switch fabric 202 via the I/O modules 208, such as one or more control loop feedback mechanisms/controllers 226. In implementations, a controller 226 can be configured as a microcontroller/Programmable Logic Controller (PLC), a Proportional-Integral-Derivative (PID) controller, and so forth. One or more of the communications/control modules 214 may include a network interface 228 for connecting the communications control system 200 to a controller 226 via a network 230. In implementations, the network interface 228 may be configured as a Gigabit Ethernet interface for connecting the switch fabric 202 to a Local Area Network (LAN). Further, two or more communications/control modules 214 can be used to implement redundant Gigabit Ethernet. However, it should be noted that Gigabit Ethernet is provided by way of example only and is not meant to be restrictive of the present disclosure. Thus, the network interface 228 may be configured for connecting the communications control system 200 to other various networks, including but not necessarily limited to: a wide-area cellular telephone network, such as a 3G cellular network, a 4G cellular network, or a Global System for Mobile communications (GSM) network; a wireless computer communications network, such as a Wi-Fi network (e.g., a Wireless LAN (WLAN) operated using IEEE 802.11 network standards); a Personal Area Network (PAN) (e.g., a Wireless PAN (WPAN) operated using IEEE 802.15 network standards); a Wide Area Network (WAN); an intranet; an extranet; an internet; the Internet; and so on. Additionally, the network interface 228 may be implemented using computer bus. For example, the network interface 228 can include a Peripheral Component Interconnect (PCI) card interface, such as a Mini PCI interface, and so forth. Further, the network 230 may be configured to include a single network or multiple networks across different access points.

The communications control system 200 may include one or more power modules 232 for supplying electrical power to field devices via the I/O modules 208. One or more of the power modules 232 may include an AC-to-DC (AC/DC) converter for converting Alternating Current (AC) (e.g., as supplied by AC mains, and so forth) to Direct Current (DC) for transmission to a field device, such as the motor 220 (e.g., in an implementation where the motor 220 comprises a DC motor). Two or more power modules 232 can be used to provide redundancy. For example, as shown in FIG. 7, two power modules 232 can be connected to each of the I/O modules 208 using a separate (redundant) power backplane 234 for each power module 232. One or more of the power backplanes 234 can be implemented in the manner of the backplane 120 described with reference to FIGS. 3A through 6. In implementations, power backplane 234 may be connected to one or more of the I/O modules 208 using electromagnetic connectors 100 a and 100 b /connector assemblies 110 (e.g., as previously described). In implementations, power backplane 234 may be included with circuit board 216, along with serial communications interface 204 and parallel communications interface 206. Power backplane 234 may include a PWN, and may be configured in the manner of backplane 120 as shown in FIGS. 3A through 6

The communications control system 200 may be implemented using a support frame 236. The support frame 236 may be used to support and/or interconnect the communications/control module(s) 214, the power module(s) 232, the switch fabric 202, the power backplane(s) 234, and/or the I/O modules 208. The circuit board 216 may be mounted to the support frame 236 using a fastener such as, for example, double sided tape, adhesive, or mechanical fasteners (e.g., screws, bolts, etc.). Additionally, the core members of the electromagnetic connectors 100 a may be mounted to the support frame 236 using a fastener such as, for example, double sided tape, adhesive, or mechanical fasteners (e.g., screws, bolts, etc.). In some implementations, a template may be used to position the core members in the channel of the support frame 236. In implementations, the top surface of a core member may be substantially flush with a top surface of the circuit board 216. In other implementations, the top surface of a core member may be recessed some distance below a top surface of the circuit board 216 (e.g., by about one millimeter (1 mm)) and/or may extend above a top surface of the circuit board 216.

The support frame 236 may include slots 238 to provide registration for the I/O modules 208, such as for aligning connectors 100 b of the I/O modules 208 with connectors 100 a included with the circuit board 216 and/or connectors 100 a of a power backplane 234. For example, an I/O module 208 may include connectors 240 having tabs/posts 242 for inserting into slots 238 and providing alignment of the I/O module 208 with respect to the circuit board 216. In implementations, one or more of the connectors 240 may be constructed from a thermally conductive material (e.g., metal) connected to a thermal plane of PCB 224 to conduct heat generated by components of the PCB 224 away from the PCB 224 and to the support frame 236, which itself may be constructed of a thermally conductive material (e.g., metal). Further, the communications control system 200 may associate a unique physical ID with each physical slot 238 to uniquely identify each I/O module 208 coupled with a particular slot 238. For example, the ID of a particular slot 238 can be associated with an I/O module 208 coupled with the slot 238 and/or a second ID uniquely associated with the I/O module 208. Further, the ID of a particular I/O module 208 can be used as the ID for a slot 238 when the I/O module 208 is coupled with the slot 238. The support frame 236 can be constructed for cabinet mounting, rack mounting, wall mounting, and so forth.

It should be noted that while the communications control system 200 is described in the accompanying figures as including one switch fabric 202, more than one switch fabric 202 may be provided with communications control system 200. For example, two or more switch fabrics 202 may be used with the communications control system 200 (e.g., to provide physical separation between redundant switch fabrics 202, and so forth). Each one of the switch fabrics 202 may be provided with its own support frame 236. Further, while both the serial communications interface 204 and the parallel communications interface 206 are described as included in a single switch fabric 202, it will be appreciated that physically separate switch fabrics may be provided, where one switch fabric includes the serial communications interface 204, and another switch fabric includes the parallel communications interface 206.

Example Process

Referring now to FIG. 15, example techniques for forming electromagnetic connectors and mating the electromagnetic connectors are described.

FIG. 15 depicts a process 1500, in an example implementation, for forming one or more electromagnetic connectors, such as the electromagnetic connectors 100 a and/or 100 b /connector assemblies 110 illustrated in FIGS. 2 through 14 and described above, and mating the electromagnetic connectors. In the process 1500 illustrated, a first electromagnetic connector is provided, where the first electromagnetic connector is configured to form a first magnetic circuit portion (Block 1510). The first magnetic circuit portion may, for instance, be constructed by providing a first core member (Block 1512) and providing a first coil disposed of the first core member (Block 1514). For example, with reference to FIGS. 2 through 14, a coil 106 is formed around or within a core member 104 a to form a magnetic circuit portion 102 a of an electromagnetic connector 100 a . In implementations, the coil 106 a may be comprised of planar windings, which may be printed on and/or embedded in a circuit board 112, as illustrated in FIG. 2. However, planar windings are provided by way of example only and are not meant to be restrictive of the present disclosure. Thus, a coil 106 a may comprise other windings, such as insulated copper windings wrapped around or within a core member 104 a , and so forth.

One or more core members 104 a and/or 104 b of the electromagnetic connectors 100 a and/or 100 b may be formed from an iron slurry material. However, this material is provided by way of example only and is not meant to be restrictive of the present disclosure. Thus, a core member 104 a and/or 104 b may comprise any material having a magnetic permeability suitable for confining and guiding magnetic fields generated by a coil 106 a and/or 106 b , including, but not necessarily limited to: soft magnetic materials (i.e., magnetic materials with low hysteresis, such as silicon steel), ferromagnetic metals (e.g., iron), ferromagnetic compounds (e.g., ferrites), and so forth.

While the core members 104 a and/or 104 b are shown as E-shaped in the accompanying figures, this particular shape is provided by way of example only and is not meant to be restrictive of the present disclosure. Thus, a core member 104 a and/or 104 b and/or the combined form of two mating core members 104 a and 104 b may comprise other shapes and/or core geometries, including, but not necessarily limited to: a straight cylindrical rod-shaped core, an “I” core, a “C”/“U” core, an “EFD” core, an “EP” core, an “ER” core, a pot core, a toroidal core, a ring/bead core, and so forth. For example, the shape of a core member 104 a and/or 104 b may be selected based upon a coupling/operating frequency. Further, a core member 104 a and/or 104 b can be implemented as a planar core (e.g., with a planar winding). In implementations, the core member 104 a and/or104 b may be formed in or on a circuit board, e.g., along with a coil 106 a and/or 106 b formed as a planar winding, such that the core member 104 a and/or 104 b is electrically insulated from the coil 106 a and/or 106 b by one or more portions of the circuit board.

In implementations where one core member 104 a or 104 b is configured to contact another core member 104 a or 104 b , the contact surfaces may be substantially flat (e.g., as illustrated in FIG. 2), but this configuration is provided by way of example only and is not meant to limit the present disclosure. Thus, other implementations may be provided, including implementations designed to increase the surface area of contact between core members and/or to provide self-alignment of the core members (e.g., by configuring a portion of one core member for insertion into another core member). For example, one core member may comprise a tapered pin configured for insertion into a tapered hole of another core member, where the outside periphery and/or an end of the tapered pin is configured to contact a portion of the interior wall and/or a bottom surface of the tapered hole.

One or more gaps may be provided between various points of a particular pair of mating core members 104 a and 104 b . For example, as illustrated in FIGS. 3A and 3B, when an E-shaped core member 104 a and/or 104 b is used, an air gap AG may be provided by shortening/truncating a middle leg of the E-shape. For example, one portion of the middle leg of the “E” may be fixedly connected to a core member 104 b , while another portion of the middle leg of the “E” may be supported proximal to, but not necessarily in electrical contact with, a core member 104 a (e.g., as shown in FIGS. 3A and 3B). In this type of implementation, the portion of the middle leg of the “E” for the core member 104 a may be supported proximal to the core member 104 a using, for example, an insulating material. Further, an air gap may be provided by mating an E-shaped core member 104 a or 104 b with a C-shaped core member, a U-shaped core member, an I-shaped core member, and so forth. For example, the middle leg of one E-shaped core member can be configured to extend through both a first circuit board with a first coil comprising a planar winding, and a second circuit board with second coil comprising a planar winding, where the outer legs of the E-shaped core member are configured to contact the legs of another U-shaped core member. In this type of configuration, the coil disposed of the U-shaped core member can be positioned between the legs of the “U.”

In one or more implementations, a second electromagnetic connector may be formed, where the second electromagnetic connector is configured to form a second magnetic circuit portion (Block 1512). The second magnetic circuit portion may be constructed by providing a second core member (Block 1522) and providing a second coil portion disposed of the second core member (Block 1524). For instance, with continuing reference to FIGS. 2 through 14, a coil 106 b is formed around or within a core member 104 b to form a magnetic circuit portion 102 b of an electromagnetic connector 100 b , as previously described. Then, the first electromagnetic connector may be mated with the second electromagnetic connector (Block 1530) to couple the first coil to the second coil with a magnetic circuit formed from the first magnetic circuit portion and the second magnetic circuit portion (Block 1532). For example, with reference to FIG. 2, a core member 104 a of a first electromagnetic connector 100 a of a connector assembly 110 may be placed in contact with another core member 104 b of a second electromagnetic connector 100 b of the connector assembly 110 to tightly couple a coil 106 a included with the first electromagnetic connector 100 a with another coil 106 b included with the second electromagnetic connector 100 b. Then, power and/or communications signals may be transmitted by energizing one of the coils 106 a or 106 b to induce a signal in the other coil 106 a or 106 b.

CONCLUSION

Although the subject matter has been described in language specific to structural features and/or process operations, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims. 

What is claimed is:
 1. A backplane comprising: a printed circuit board defining a plurality of apertures therethrough; a plurality of first electromagnetic connectors disposed in the apertures of the printed circuit board, each one of the plurality of first electromagnetic connectors configured to form a respective first magnetic circuit portion, each one of the plurality of first electromagnetic connector configured to mate with a respective second electromagnetic connector of a pluggable module to couple the pluggable module with the backplane, the respective second electromagnetic connector configured to form a respective second magnetic circuit portion, the respective first magnetic circuit portion and the respective second magnetic circuit portion configured to form a respective magnetic circuit when the respective first electromagnetic connector is mated with the respective second electromagnetic connector and maintain isolation between the pluggable module and the backplane.
 2. The backplane as recited in claim 1, wherein each respective magnetic circuit is configured for at least one of a communications signal or a power signal.
 3. The backplane as recited in claim 1, further comprising a cover for at least partially enclosing at least one of the plurality of first electromagnetic connectors.
 4. The backplane as recited in claim 1, wherein at least one of the plurality of first electromagnetic connectors comprises a planar winding disposed on the printed circuit board.
 5. The backplane as recited in claim 1, wherein at least one of the plurality of first electromagnetic connectors comprises an E-shaped core member.
 6. The backplane as recited in claim 1, wherein each respective magnetic circuit comprises an air gap.
 7. A system comprising: a printed circuit board comprising a plurality of electromagnetic connectors, each one of the plurality of electromagnetic connectors comprising a first electromagnetic connector comprising a first core member and a first coil disposed about the first core member, the printed circuit board defining an aperture therethrough, the first core member extending through the aperture defined by the printed circuit board; and a module comprising a second electromagnetic connector comprising a second core member and a second coil disposed about the second core member, the second coil comprising a wire wound coil, each respective first core member of the plurality of electromagnetic connectors and the second core member configured to couple each respective first coil to the second coil to form a respective magnetic circuit when each respective first electromagnetic connector is mated with the second electromagnetic connector, each respective magnetic circuit configured to induce a signal in the second coil when each respective first coil is energized while maintaining isolation between the module and the printed circuit board.
 8. The system as recited in claim 7, wherein the signal induced in the second coil comprises at least one of a communications signal or a power signal.
 9. The system as recited in claim 7, wherein each respective first core member is configured to provide alignment with the second core member when the first electromagnetic connector is mated with the second electromagnetic connector.
 10. The system as recited in claim 7, wherein each respective first coil comprises a planar winding disposed on a printed circuit board.
 11. The system as recited in claim 7, wherein each respective first core member comprises an E-shaped core member.
 12. The system as recited in claim 7, wherein each respective magnetic circuit formed from each respective first core member and the second core member comprises an air gap.
 13. An industrial control system comprising: a backplane for distributing an Alternating Current (AC) signal, the backplane configured to provide power and bidirectional communications; a plurality of first electromagnetic connectors coupled with the backplane, each one of the plurality of first electromagnetic connectors configured to mate with a second electromagnetic connector of an input/output module to couple the input/output module with the backplane to form a magnetic circuit and provide bidirectional communications between the backplane and the input/output module while maintaining isolation between the input/output module and the backplane.
 14. The industrial control system as recited in claim 13, further comprising Direct Current (DC)-to-AC (DC/AC) conversion circuitry coupled with the backplane for converting a DC signal to the AC signal distributed via the backplane.
 15. The industrial control system as recited in claim 14, wherein the DC/AC conversion circuitry comprises Pulse-Width Modulation (PWM) circuitry.
 16. The industrial control system as recited in claim 13, further comprising: a plurality of modules configured to at least one of transmit or receive data; a serial communications interface configured for connecting the plurality of modules in parallel; and a parallel communications interface configured to individually connect the plurality of modules.
 17. The industrial control system as recited in claim 16, wherein at least one of the plurality of modules comprises the second electromagnetic connector, and at least one of the serial communications interface or the parallel communications interface is connected to the at least one of the plurality of modules by mating the second electromagnetic connector with each one of the plurality of first electromagnetic connectors.
 18. The industrial control system as recited in claim 16, wherein the serial communications interface comprises a multidrop bus.
 19. The industrial control system as recited in claim 16, wherein the parallel communications interface comprises a cross switch.
 20. The industrial control system as recited in claim 16, wherein the serial communications interface and the parallel communications interface are formed on a single printed circuit board with the backplane. 